They should work for the SIP the same way, as the do for other native devices (AMX driver for example).At the very start of i2control app natove driver automatically connecting and EVENT_ONLINE must take place.But it doesn't.

Why?The Background mode allows drivers to work even if you minimize the app.So, when background mode is on, and you minimize the app -> nothing happens. EVENT_ONLINE & EVENT_OFFLINE aren't happen.After 3 minutes (or 19 minutes, if you use Location tag) the app will be closed by iOS. The app doesn't receive EVENT_OFFLINE when it happens, because iOS stops the app externally, not as a normal process of app closing. And EVENT_OFFLINE do not have time to work.